The HENCO 5L PE-Xc pipes are made of five layers; a PE-Xc inner pipe, an adhesive layer and a centrally positioned oxygen barrier, protected by an outer PE-Xc layer. Thanks to the oxygen barrier the pipe responds to the requirements specified in DIN 4726 for oxygen diffusion heating systems. Thus the HENCO 5L PE-Xc pipes are perfectly suitable for use in heating installations.